A. Total
B. Minimum
C. Operating
D. Maximum permissible
Related Mcqs:
- In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions: (i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point ?
A. Condenser and reboiler loads are the same in both the cases
B. Reboiler load is the same in both the cases but condenser load is higher in case (ii)
C. Condenser load is the same in both the cases but reboiler load is higher in case (ii)
D. Both condenser and reboiler loads are higher in case (ii) as compared to case (i) - In McCabe-Thiele method, at infinite reflux ratio___________________?
A. Number of plates is maximum
B. Overhead product is maximum
C. Both the operating lines coincide with the diagram
D. None of these - In McCabe-Thiele method, at infinite reflux ratio________________?
A. The overhead product is minimum
B. Both the operating lines coincide with diagonal
C. Both A. and B.
D. Neither A. nor B. - McCabe-Thiele method of binary distillation does not assume that the__________________?
A. Sensible heat changes are negligible compared with latent heat changes
B. Molar latent heats of all components are equal
C. Heat of mixing is negligible
D. None of these - The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is____________________?
A. 2
B. 0.5
C. 50
D. 150 - Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption?
A. Lower than
B. Higher than
C. Same as
D. Either same or higher than - At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?
A. 0
B. 1
C. ∞
D. < 1 - If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively ?
A. [xD/(RD + 1)], [RD/(RD + 1)]
B. [RD/(RD + 1)], [xD/(xD + 1)]
C. [xD/(RD + 1)], [(RD + 1)/RD]
D. None of these - If f = moles of vapour present per mole of feed, then the slope of feed line is (McCabe- Thiele method) ________________________?
A. (1 – f)/f
B. – (f – 1)/f
C. -1/f
D. -f/(1 – f) - A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?
A. Composition of vapors and that of liquid do not vary throughout the column
B. Reboiler load and condenser load are minimum
C. The top and bottom compositions are unchanged with and without total reflux
D. The top and bottom compositions correspond to the maximum enrichment available
